# CVE-2022-49808: linux: In the Linux kernel, the following vulnerability has been resolved:  net: dsa: don't leak tagger-owned storage on swi...

CVE-2022-49808 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49808, released May 1, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49808
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0017
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 1, 2025

## Description

In the Linux kernel, the following vulnerability has been resolved:  net: dsa: don't leak tagger-owned storage on switch driver unbind  In the initial commit dc452a471dba ("net: dsa: introduce tagger-owned storage for private and shared data"), we had a call to tag_ops->disconnect(dst) issued from dsa_tree_free(), which is called at tree teardown time.  There were problems with connecting to a switch tree as a whole, so this got reworked to connecting to individual switches within the tree. In this process, tag_ops->disconnect(ds) was made to be called only from switch.c (cross-chip notifiers emitted as a result of dynamic tag proto changes), but the normal driver teardown code path wasn't replaced with anything.  Solve this problem by adding a function that does the opposite of dsa_switch_setup_tag_protocol(), which is called from the equivalent spot in dsa_switch_teardown(). The positioning here also ensures that we won't have any use-after-free in tagging protocol (*rcv) ops, since the teardown sequence is as follows:  dsa_tree_teardown -> dsa_tree_teardown_master    -> dsa_master_teardown       -> unsets master->dsa_ptr, making no further packets match the          ETH_P_XDSA packet type handler -> dsa_tree_teardown_ports    -> dsa_port_teardown       -> dsa_slave_destroy          -> unregisters DSA net devices, there is even a synchronize_net()             in unregister_netdevice_many() -> dsa_tree_teardown_switches    -> dsa_switch_teardown       -> dsa_switch_teardown_tag_protocol          -> finally frees the tagger-owned storage

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.10-1 | [DEBIAN-CVE-2022-49808](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49808.md) | May 1, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.10-1 | [DEBIAN-CVE-2022-49808](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49808.md) | May 1, 2025 |
| Linux | linux Debian 14 | 6.0.10-1 | [DEBIAN-CVE-2022-49808](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49808.md) | May 1, 2025 |

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Data as of 2026-11-10T07:50:38Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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